hi, you have an error in your jboss-aop.xml file, you need to wrap the introduction defenitions in a mixin tag, eg: | <aop> | <introduction class="Calculator"> | <mixin> | <interfaces> | Main | </interfaces> | <class> | MainImpl | </class> | <construction> | new MainImpl() | </construction> | </mixin> | </introduction> | </aop> | i tried the rest of your code in a small app and it worked as expected. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982319#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...